22 



Dr. W. S. Day on a Comparison of 

 Table VII. {continued). 



Observed readings. 

 Tonnelot. Baudin. 



Beduced readings. 



Tonnelot Baudin 

 H. scale. Abs. scale. 



Differences. 

 T.-B. 



1 April, 1897.— Tonnelot 11800 and Baudin 6165. 



At beginning, observed zero of Baudin 6165, 3*824 cm. 

 At beginning, reduced zero of Baudin 6165, +0 o, 292. 



10-971 



16-530 cm. 



11-153 



11-133 



+0020 



18-209 



23-930 „ 



17-434 



17-415 



+0019 



31-533 



38-062 „ 



29-004 



28-999 



+0005 



24 March, 1897.— Tonnelot 11801 and Baudin 6166. 



At beginning, observed zero of Baudin 61 66, 2'420 cm. 

 At beginning, reduced zero of Baudin 6166, +0°'305. 



10-521 

 19573 



28-645 



15-844 cm. 

 27 544 „ 

 39-242 „ 



10-417 



10-399 



+0-018 



19-459 



19420 



+0-039 



28-528 



28-509 



+0-019 



26 March, 1897.— Tonnelot 11811 and Baudin 6166, 



At beginning, observed zero of Baudin 6166, 2417 cm. 

 At beginning, reduced zero of Baudin 6166, +0 o- 297. 



9-613 

 21-795 

 30190 



14-610 cm. 

 29-896 „ 

 40-415 „ 



9-456 



9-440 



+0016 



21-270 



21-241 



+0029 



29-442 



29-428 



+0014 



1 April, 1897.— Tonnelot 11800 and Baudin 6166. 



At beginning, observed zero of Baudin 6166, 2*418 cm. 

 At beginning, reduced zero of Baudin 6166, +0 o- 293. 



10-861 



16-664 cm. 



11-057 



11-038 



+0019 



18-171 



24-896 „ 



17-402 



17*372 



+0030 



31-143 



39-417 „ 



28-664 



28-648 



+0-016 



26 April, 1897.— Tonnelot 11801 and Baudin 6163. 



At beginning, observed zero of Baudin 6163, 6'006 cm. 

 At beginning, reduced zero of Baudin 6163, +0°'221. 



9539 

 19-674 

 30-825 

 39-512 



14-454 cm. 

 23-550 ,. 

 33-691 ,', 

 41-454 „ 



9-432 

 19-555 

 30-707 

 39-331 



9-427 

 19-548 

 30-721 

 39-354 



+0-005 

 +0007 

 -0014 

 -0-023 



The two comparisons of each pair seemed to agree so well 

 that without taking any further time to make more comparisons, 

 it was decided that they represented substantially the difference 

 between the thermometers. From these comparisons smooth 

 correction-curves were drawn, so that the readings of the 

 thermometers 11800 and 11811 could be reduced to those 

 of 1180). These corrections, however, are small, amounting 

 in mos cases to only a few thousandths of a degree. A 



